Abstract

Effective removal of toxic 1,5-naphthalenedisulfonic acid (NDS) and 2-naphthalenesulfonic acid (NSA) from contaminated water still faces a challenge to date. Herein, porous MIL-101, MIL-101-NH2, and MIL-101-SO3H were systematically studied for their adsorption performances toward these toxic molecules. Upon the introduction of −NH2 groups, H-bond interaction and electrostatic interaction were enhanced, and accordingly MIL-101-NH2 can exhibit more excellent adsorption capacity (NDS, 188.1 mg g–1; NSA, 285.0 mg g–1) compared to MIL-101-SO3H, MIL-101, and some other common adsorbents. Further study indicates that MIL-101-NH2 can be easily regenerated even after three adsorption processes. This work demonstrates that MIL-101-NH2 may have large potential in naphthalenesulfonic acids removal and rational selection of organic functional groups may be critical in construction of adsorbents.

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